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Proceedings Paper

Mid-infrared vertical-cavity surface-emitting lasers based on lead salt/BaF2 Bragg mirrors
Author(s): Martin Eibelhuber; Thomas Schwarzl; Andreas Winter; Harald Pascher; Wolfgang Heiss; Gunther Springholz
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Paper Abstract

We demonstrate mid-infrared continuous-wave vertical-cavity surface-emitting lasers based on Bragg mirrors using IV-VI semiconductors and BaF2. This material combination exhibits a high ratio between the refractive indices of up to 3.5, leading to a broad mirror stop band with a relative width of 75 %. Thus, mirror reflectivities higher than 99.7 % are gained for only three layer pairs. Optical excitation of microcavity laser structures with a PbSe active region results in stimulated emission at various cavity modes between 7.3 μm and 5.9 μm at temperatures between 54 K and 135 K. Laser emission is evidenced by a strong line width narrowing with respect to the line width of the cavity mode and a clear laser threshold at a pump power of 130 mW at 95 K. Furthermore, we study a similar microcavity but without an active region. The resonance of such an empty microcavity has a narrow line width of 5.2 nm corresponding to a very high finesse of 750, in good agreement to transfer matrix simulations and to the expected mirror reflectivities.

Paper Details

Date Published: 1 February 2008
PDF: 8 pages
Proc. SPIE 6900, Quantum Sensing and Nanophotonic Devices V, 69000E (1 February 2008); doi: 10.1117/12.783927
Show Author Affiliations
Martin Eibelhuber, Johannes Kepler Univ. (Austria)
Thomas Schwarzl, Johannes Kepler Univ. (Austria)
Andreas Winter, Univ. Bayreuth (Germany)
Harald Pascher, Univ. Bayreuth (Germany)
Wolfgang Heiss, Johannes Kepler Univ. (Austria)
Gunther Springholz, Johannes Kepler Univ. (Austria)

Published in SPIE Proceedings Vol. 6900:
Quantum Sensing and Nanophotonic Devices V
Rengarajan Sudharsanan; Christopher Jelen, Editor(s)

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